Tube construction.



R. R. ELLIS.

A TUBE CONSTRUCTION. APPLICATION FILED' Nov. zo, 1909.

Patented Mar. 28, 1911 nrcHARD n. ELLIS,- oF nETRoIT, MICHIGAN.

' TUBE CONSTRUCTION.

Y Specification of Letters Patent. Patented lVIVal. 28, V19711Application me@ November 2o, 1909. semina' 529,036.

To all 'whom 'if may concern:

Be it known that I, RICHARD R. ELLIS, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan,

have invented .a certain new and useful Improvement in TubeConstruction, and declare the following to be a full, clear, and

exact description of the same, such as will enable others skilled in theart to which it pertains to make and use the same, reference.

vbeing had to the accompanying drawings,

be external isleft as a double seamed tube,

which for some structures may be a straight tube and for otherstructures a conical tube. That one of the members which is intended forthe interior is grooved on the side opposite the double seam, on thistube, with a reentering groove that in the assembled structure engagesalong and partially around the double seam of the outer tube.

In the drawings this structure is shown andv applied to what is known tothe trade as a carriage bow. socket, but the construe. tion of the tubemay be used for either straight or conical work as may 'be desired.

In the drawings: Figure-1, is a cross section of the tube. Fig. 2, is across section of the outer member in its folded vform. Fig. 3, is across section of the inner or reinforcing member. Fig. 4, shows acomplete bow socket.

` The outer tube or member IA is bent from sheet metal and the meetingedges are lapped and infolded to make what is known as a double'seamedjoint 2; the inner member B made of a size to, tit accurately andtightly within the outer member, into which it can be forced, but intowhich it would not slide easily, is formed from sheet metal with edgesmeeting-at double seamedA joint 3. Opposite the double seamed joint 3the walls of thev tube are grooved with a rentering oove 4, ro er insizeto en a e closel viround thepdolilble seamed joinizgand thi;` member Bis forced into the member A with the groove 4 engaging around theseam 2and with the double seam 3 lyingclosely against the straight wall of theouter tube A.

When in this condition and arrangement the inner tube prevents the outertube from yielding or spreading along the seam which is securely lockedby the walls of the inner tube, and the outer tube also serves to-lockthe double seam of the inner tube, and thus, each serves to lock theseam of the other and the entire structure is extremely strong.

Vv'hen used for a bow socket the structure is made with each part A andB conical in shape, vand the inner tube or member is forced into theouter tube 'or member until the engagement'is close and secure, and thecoupling forging 7 is driven into the small end and secured thereto,generally and preferably by electric welding, but inasmuch as thespecial application to which the tube is .applled does not form the mainsubject of this invention, this isshown as a merely use-- ful purpose ofthe tubular structure, and is not intended to yillustrate the sole useto which it can be put.

vWhat I claim is 1. A tubular structure, having, in combination with anouter tube having the edges of the component sheet of metal united by a4double seamed joint, an. originally independent inner tube engaglngclosely within said outer tube, said inner tube also having vits meetingedges united by a double seamed joint, and being provided with alengthwise extending groove opposite said joint, said oove bein adaptedto register with the jointed portlon of the outer tube, and the jointedportion of the inner tube lying against the plain inner face of theouter tube opposite its jointed portion, substantially as described.

2. A tubular structure, having, in combination with an outer tube havingthe meetl ing edges of its component metal walls united by a doubleseemed joint, a closely tting inner tube having -its meeting edgessimilarly united, but adapted to berlo'cated on the opposite side of theassembled tube from thatwhereon the meeting edges .of-the outer tube arelocated, said inner tube being provided with a longitudinal groovewherein the double seamed joint in the outer tube" engages the mass ofthe' joined edges of the outer tube being so accommodated wit-hin saidgroove as to leave thecurvature ofthe outer periphery of the tuberactically un-` broken,substantially as described 3.l Atubularstructurefcomprising a pair -of originally independent telescopingtubes,

each lm ving a, longitudinally extending -double seemed joint, and theinner one of said tubes having oppositely located to said joint alongitudinally extending groove wherein said jointed portion of theoutei` tube engages when the two tubes are in assembled relation, saiddouble seemed joint in the inner tube engaging against the adjacentplane inner face of the outer tube with its parte eeenee pressed closelyagainst one another thereby, lo

nioininn n. Ennis.

Witnesses I C. F. BURTON, W'ILLlAM M. SWAN.

